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December 07, 2019, 11:52:24 AM


Author Topic: AF advise needed!  (Read 3421 times)

Offline qartveli

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AF advise needed!
« on: February 07, 2013, 08:37:11 AM »
Hi to All
I have 550d and have some problem with AF through viewfinder. it is shifted forward, but works perfect when I make focus through LCD. is there any reason use warranty and repair or it is design problem? does it helps?
Thanks
Qartveli 

Offline AndyCivil

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Re: AF advise needed!
« Reply #1 on: February 07, 2013, 10:30:20 AM »
First, did you adjust the viewfinder's own focus to your eye? Ask yourself: the green display within the viewfinder - is it in focus or not? You can't judge the image, unless the viewfinder itself is sharp. Tiny jogwheel labelled
+

-

When you shoot a photo that seems to be 'off' in the viewfinder, do you find that the picture taken is actually sharp after all?

Second, it's possible that it's the lens. When you use LCD 'live' focusing, it adjusts to maximise sharpness, and this nulls out any error of adjustment in the lens, and doesn't use the phase sensor in the pentamirror.

Try a different lens. If a different lens results in sharp pictures, then the lens should be returned to the manufacturer for adjustment. If a different lens also results in blurred pictures, then the phase sensor (for "quick" autofocus) is at fault, and the camera may need repair.

Offline qartveli

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Re: AF advise needed!
« Reply #2 on: February 07, 2013, 10:59:16 AM »
Thanks for response!
yes viewfinder adjusted. I checked on tripod all 3 my lenses and same result. first I thought it is lens problem but I bought after 60mm macro and 50mm f/1.4 and both have same issue. so through LCD I can get very sharp image and focus works perfect. in Manual mode also can get sharp image just AF is slightly shifted forward. I'm interesting if repairing can improve that issue?

Offline AndyCivil

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Re: AF advise needed!
« Reply #3 on: February 07, 2013, 11:48:28 AM »
There was a guy on here last year that had exactly the same issue, it's a pity he didn't report back to say what happened.
http://www.t2iforum.com/1/help-regarding-the-focusing-issue-t2i/msg54882/#msg54882
It really does sound like the phase focus device in the pentamirror is giving an 'off' reading, either because it's shifted (did you bump it hard, LOL?) or because the camera wasn't 'tuned' in the factory correctly (I'm working outside my knowledge level here, by the way) but in either case, I think Canon should be able to fix it, hopefully under warranty. I don't think it's a DIY job, or something you can work around.

P.S. you could send the guy a PM on this forum, I think he'd get an email telling him.

Offline qartveli

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Re: AF advise needed!
« Reply #4 on: February 07, 2013, 11:57:07 AM »
Thanks! Camera is brand new just few days and no bumped. I will try to contact him and ask. Thanks once again

Offline Skippy

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Re: AF advise needed!
« Reply #5 on: February 07, 2013, 08:01:49 PM »
Thanks! Camera is brand new just few days and no bumped. I will try to contact him and ask. Thanks once again
If the store that you bought the camera from is convenient then I would go right back there. If there is something wrong then let it be their problem. I would exchange if at all possible. Otherwise, I would call Canon and send it in. I really like what Canon has done for me the three times I have sent something in so if it isn't right and you can't exchange then don't hesitate.
I'm an old film guy just playing catchup in this digital world. Help me out.

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Offline qartveli

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Re: AF advise needed!
« Reply #6 on: February 07, 2013, 11:38:20 PM »
Thanks Skippy!
I red on Canons site that it is ordinary issue, but can be repaired or not no information. just suggestions switch to MF

Offline holdermanT2i

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Re: AF advise needed!
« Reply #7 on: March 05, 2013, 09:21:50 AM »
I had the exact same problem. Sent the T2i to Canon with lenses 3 times. Standard response of "within specs" etc...Finally i had to go through corporate and have a supervisor there authorize a replacement because Canon does not have a replacement policy, only repair. So they sent me a "Refurbished" T2i because as the supervisor stated "There is obviously something wrong with the camera" according to her engineers but yet it is within specs? Very long 4 month process. Problem was fixed with the Refurb. Many will argue its the user. Possible i guess but I borrowed a 7D and used my lens and I got beautiful pics 95% of the time. I find still the closer my subject the better, and anything within flash range seems to be fine. Also my local pro camera shop, where pros own it and work, not just salesmen, told me they have heard this auto focus "rumor" regarding the T2i from more than a few people. Just my .02